libmy.a : add.o sub.o
	ar -rc $@ $^
%.o:%.c
	gcc -c $<
.PHONY:clean
clean:
	rm -rf *.a *.o stdc

.PHONY:output
output:
	mkdir -p stdc/include
	mkdir -p stdc/lib
	cp -f *.h stdc/include
	cp -f *.a stdc/lib
